feat: add Phase 8 extended window functions#24
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- Add PERCENT_RANK and CUME_DIST tests (DataFusion native) - Implement RATIO_TO_REPORT via SQL rewrite (expr / SUM(expr) OVER) - Add Go integration tests for window functions
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Summary
Phase 8: Extended Window Functions
Note: CONDITIONAL_TRUE_EVENT / CONDITIONAL_CHANGE_EVENT はスキップ (複雑なカスタム Window UDF が必要)
Changes
engine/src/sql_rewriter.rs: RATIO_TO_REPORT 実装engine/src/executor.rs: テスト追加go/integration_test.go: Phase 8 統合テストTest plan
cargo fmt --checkcargo clippy -- -D warningscargo test --workspace(199 tests)